Updated from Linux LTS 3.10.24 to 3.10.25
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@@ -410,6 +410,7 @@ EXPORT_SYMBOL(dump_fpu);
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unsigned long get_wchan(struct task_struct *p)
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{
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struct stackframe frame;
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unsigned long stack_page;
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int count = 0;
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if (!p || p == current || p->state == TASK_RUNNING)
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return 0;
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@@ -418,9 +419,11 @@ unsigned long get_wchan(struct task_struct *p)
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frame.sp = thread_saved_sp(p);
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frame.lr = 0; /* recovered from the stack */
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frame.pc = thread_saved_pc(p);
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stack_page = (unsigned long)task_stack_page(p);
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do {
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int ret = unwind_frame(&frame);
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if (ret < 0)
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if (frame.sp < stack_page ||
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frame.sp >= stack_page + THREAD_SIZE ||
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unwind_frame(&frame) < 0)
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return 0;
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if (!in_sched_functions(frame.pc))
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return frame.pc;
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